单相受热管的移动参数模型

Moving parameter model for single phase flow in heated pipes

集总参数模型建模简单,实时性好,广泛用于实时仿真中,但其动态精度较低。为了提高单相受热管的集总参数模型的动态精度,通过对单相受热管的传热过程进行研究,并结合集总参数模型的建模机制,提出了"移动参数"模型。在这个模型中,集总参数不再是管段出口参数或者是进出口参数的算术平均值,其位置将随着入口焓扰动的发生和传播而移动。对该模型的动态响应特性进行了仿真研究。结果表明,这种模型更加符合单相受热管的动态传热过程,修正了通用的集总参数模型的过度简化,更好地反映了对象的分布参数特性。

Lumpedparameter models have been applied to realtime simulation modeling because of their simplicity and speed but their dynamic precision is relatively low. An improved lumpedparameter model based on a 'moving parameter' model was developed for singlephase flow in heated pipes based on analysis of the heating process. In this model, the location of the lumped parameter changed with the occurrence of disturbances. Simulations indicate that the new model more accurately reflects the distributed parameter characteristics of the thermal system with much simplier calculations.